PageFlow issue

Feb 13, 2007 at 7:56 PM
Hi,
I am new in Web client software factory and I am using Page flow project in current project. When the application is trying to access first page of defined in pageflow class, I got error message:

Value cannot be null.
Parameter name: type
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.ArgumentNullException: Value cannot be null.
Parameter name: type

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[ArgumentNullException: Value cannot be null.
Parameter name: type]
System.Activator.CreateInstance(Type type, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes) +2799743
System.Activator.CreateInstance(Type type, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture) +23
Microsoft.Practices.PageFlow.PageFlowDirectory.BuildProvider() +297
Microsoft.Practices.PageFlow.PageFlowDirectory.get_Provider() +77

... (more error message)

Actually, this error is not generated by my code, it happens before the page loads.
Does any one can help?
Apprecitae.
Thanks
MAX